In a previous post, Underwood revealed that her son, Isaiah, does not really get to watch her perform onstage because he goes to bed before her concerts. The first time the toddler saw his mommy sing before a huge crowd was at the NHL playoff game at the Bridgestone Arena earlier this year where she was chosen to perform the national anthem.

In her post, the country star masterfully belted out the final lines of the "Star Spangled Banner." From the audience, Isaiah jumped up and down in glee, clapping with the crowd.

Carrie Underwood's Relationship With Son Isaiah

Underwood has always been open to fans about her personal life and her growing family. On her social media pages, she has shared snippets of a normal day inside the Fisher household in their home in Nashville.

The "Cry Pretty" singer has posted photos and short videos of Isaiah watching ice hockey, joining his famous parents' workout, and even attempting to shave his father's beard with an electric razor.

She has also spoken about her son during interviews. In a conversation with People, the 35-year-old mom revealed the one thing that Isaiah does that make her feel beautiful, especially after she injured her face in an accident last fall.

"I feel the prettiest when my kid says something that's just super sweet," the former American Idol said. "This morning, Melissa, my hair and makeup artist, was starting to put my makeup on and he's all in his pajamas and he said, 'No, don't do that!' and I was like, 'Why, baby, why are you upset?' And he said, 'I like you just how you are.'"